Dynamics of a single trapped ion immersed in a buffer gas

• Verfasst von: Höltkemeier, Bastian [VerfasserIn]
• Verfasst von: Weckesser, Pascal [VerfasserIn]
• Verfasst von: López-Carrera, Henry [VerfasserIn]
• Verfasst von: Weidemüller, Matthias [VerfasserIn]
• Titel: Dynamics of a single trapped ion immersed in a buffer gas
• Verf.angabe: Bastian Höltkemeier, Pascal Weckesser, Henry López-Carrera, Matthias Weidemüller
• E-Jahr: 2016
• Jahr: 7 December 2016
• Umfang: 10 S.
• Fussnoten: Gesehen am 20.05.2020
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2016
• Band/Heft Quelle: 94(2016,6) Artikel-Nummer 062703, 10 Seiten
• ISSN Quelle: 2469-9934
• DOI: doi:10.1103/PhysRevA.94.062703
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1698604416

Abstract

We provide a comprehensive theoretical framework for describing the dynamics of a single trapped ion interacting with a neutral buffer gas, thus extending our previous studies on buffer-gas cooling of ions beyond the critical mass ratio [B. Höltkemeier et al., Phys. Rev. Lett. 116, 233003 (2016)]. By transforming the collisional processes into a frame, where the ion's micromotion is assigned to the buffer-gas atoms, our model allows us to investigate the influence of nonhomogeneous buffer-gas configurations as well as higher multipole orders of the radio-frequency trap in great detail. Depending on the neutral-to-ion mass ratio, three regimes of sympathetic cooling are identified which are characterized by the form of the ion's energy distribution in equilibrium. We provide analytic expressions and numerical simulations of the ion's energy distribution, spatial profile, and cooling rates for these different regimes. Based on these findings, a method for actively decreasing the ion's energy by reducing the spatial expansion of the buffer gas arises (forced sympathetic cooling).